New Spectroscopy with Charm and Beauty Multiquark States

Abstract

Exotic charmonium and bottonomium resonances recently discovered are discussed and interpreted as diquark-antidiquark states containing a pair of charm quarks and a pair of light, up and down, quarks. Successes, shortcomings and predictions of the model are illustrated.Comment: Talk given at the Erice School of Subnuclear Physics, June 30, 2013, Ettore Majorana Foundation and Center for Science and Culture, Erice, Ital